492 



Pustules covered by the epidermis. Perithecia 4-20, globose, 

 with thick walls, J-J mm. diam., buried in the inner bark with their 

 bases often slightly sunk in the wood beneath, necks slender, converg- 

 ing. Ostiola erumpent in a compact fascicle, in all well-developed 

 specc. distinctly quadrisulcate-cleft, generally not rising much above 

 the surface of the bark, but sometimes elongated-cylindrical, even 

 1 mm. or more long, and slightly swollen at the apex. Asci clavate, 

 minute, 20-25 x 5 /i (p. sp.), (30 x 10 /i, Cke.). Sporidia irregularly 

 crowded, minute, 3-4 xl/i, allantoid, strongly curved, hyaline, (5 yt 

 long, Cke.). 



On dead limbs of Ailanthus glandulosa, Carolina (Ravenel). 

 Staten Island, N. Y. (Mrs. Britton), Long Island, N. Y. (Underwood). 



The surface of the inner bark in all the specc. is uniformly black- 

 ened. Sec. Cke. Grev. VII f p. 52, the ostiola are not sulcate, but in 

 our copy of Rav. F. Am. and in that at the Phila. Acad, they are un- 

 mistakably so. The yellowish sporidia and black, thick-walled peri- 

 thecia point directly to Eutypella, and we have no hesitation in 

 placing this species there. The length of the ostiola in this and other 

 species is often variable. On a hickory limb lying with one end on 

 moist ground and the other end high and dry, we have seen Valsa 

 caryigena, B. & C, occupying the entire length of the limb, with the 

 ostiola at the upper, dry end of the limb, scarcely projecting above the 

 bark, while at the lower, damp end, they were exserted, 1-2 mm. long. 



En. prunastri, (Pers.) 



Sphceria prunastri, Pers. Syn. p. 37. 

 Valsa prunastri, Fr. Summa, p. 411. 

 Eutypella prunastri, Sacc. Syll. 566. 

 Exsicc. Fckl. F. Rh. 596. Rehm Asc. 477. Sydow, M. March. 976. Desra. PI. Crypt 

 Fd. I, 478. 



Stroma valsiform, suborbicular or elliptical in outline, pulvinate, 

 convex or subconical, black, adnate to the wood, at first covered by 

 the bark, finally erumpent through transverse cracks in the epidermis. 

 Perithecia numerous, irregularly crowded, sometimes in more than one 

 layer, the central ones erect, the marginal ones ascending, subglobose 

 or angular, attenuated into a neck of variable length. Ostiola thick- 

 ened, 3-5- (generally 4-) sulcate, short and erect, or longer and diver- 

 gent or flexuous. Asci narrow-clavate, long-stipitate, 20-30 x 3-4 ju 

 (p. sp.). Sporidia in the upper part of the asci, subbiseriate, allan- 

 toid, curved, subhyaline, 6-8 x 1| fi. Spermogonia, Cytispora rubes- 

 cens, Fr. 



On Prunus serotina, Carolina (Schw.)* 



